SLIDE 21 21 21
A Crisis of Hush Function
A simple version of SHA-1 in August of 2004(A version which decreased 36steps to 80steps) Beginning that a collision between MD4 and MD5 was reported (easy forgery)、a crisis of Hush function to be pivot of an electric signature etc.
Applied Examples in Applied Examples in Hush Function Hush Function I nfluence Degree I nfluence Degree Future Counter Measures Future Counter Measures Electric signatures Electric signatures There is it (under the present conditions, There is it (under the present conditions, the electric signature method is not the electric signature method is not recognized except SHA recognized except SHA-
1) I nstalling an anti I nstalling an anti-
public key code measure WG in CRYPTREC, leading the measure WG in CRYPTREC, leading the revision of electric signatures methods revision of electric signatures methods.
.
Time stamps Time stamps There is it (I nfluences to long There is it (I nfluences to long-
time use of time stamp. Time business began since time stamp. Time business began since February 7 February 7 th
th in H. 17)
in H. 17) I nputting information to Time Business I nputting information to Time Business promotion meeting, participate time promotion meeting, participate time stamp stamp technologies WG. technologies WG.
Key joint ownership technology technology
Messages Certification (HMAC) Certification (HMAC)
Pro-
para-
random-
number generation Small Small estimate estimate I nspection of problems in WG of I nspection of problems in WG of CRYPTREC CRYPTREC
Support of CRYPTREC (Hush Function Connection) Support of CRYPTREC (Hush Function Connection) Support of CRYPTREC (Hush Function Connection) Support of CRYPTREC (Hush Function Connection)
Correspondence in NI CT
A cross inspection if reports of the arts & sciences actually influence the users, based on the results, it is contribution greatly to a correspondence policy in CRYPTREC.